Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve articles/aa/epub2/2022/04/aa42908-21/aa42908-21.epub, which is not a DOI.
articles/aa/epub2/2022/04/aa42908-21/aa42908-21.epub may be a Handle (DOIs are a special sort of Handle). If articles/aa/epub2/2022/04/aa42908-21/aa42908-21.epub is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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